mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-02-24 07:02:27 +01:00
83f684c66c
byuu says: Note: for Windows users, please go to nall/intrinsics.hpp line 60 and correct the typo from "DISPLAY_WINDOW" to "DISPLAY_WINDOWS" before compiling, otherwise things won't work at all. This will be a really major WIP for the core SNES emulation, so please test as thoroughly as possible. I rewrote the 65816 CPU core's dispatcher from a jump table to a switch table. This was so that I could pass class variables as parameters to opcodes without crazy theatrics. With that, I killed the regs.r[N] stuff, the flag_t operator|=, &=, ^= stuff, and all of the template versions of opcodes. I also removed some stupid pointless flag tests in xcn and pflag that would always be true. I sure hope that AWJ is happy with this; because this change was so that my flag assignments and branch tests won't need to build regs.P into a full 8-bit variable anymore. It does of course incur a slight performance hit when you pass in variables by-value to functions, but it should help with binary size (and thus cache) by reducing a lot of extra functions. (I know I could have used template parameters for some things even with a switch table, but chose not to for the aforementioned reasons.) Overall, it's about a ~1% speedup from the previous build. The CPU core instructions were never a bottleneck, but I did want to fix the P flag building stuff because that really was a dumb mistake v_v'
78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
alwaysinline auto op_readpc() -> uint8 {
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return op_read((regs.pc.b << 16) + regs.pc.w++);
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}
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alwaysinline auto op_readstack() -> uint8 {
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regs.e ? regs.s.l++ : regs.s.w++;
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return op_read(regs.s.w);
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}
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alwaysinline auto op_readstackn() -> uint8 {
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return op_read(++regs.s.w);
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}
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alwaysinline auto op_readaddr(uint32 addr) -> uint8 {
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return op_read(addr & 0xffff);
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}
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alwaysinline auto op_readlong(uint32 addr) -> uint8 {
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return op_read(addr & 0xffffff);
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}
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alwaysinline auto op_readdbr(uint32 addr) -> uint8 {
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return op_read(((regs.db << 16) + addr) & 0xffffff);
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}
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alwaysinline auto op_readpbr(uint32 addr) -> uint8 {
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return op_read((regs.pc.b << 16) + (addr & 0xffff));
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}
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alwaysinline auto op_readdp(uint32 addr) -> uint8 {
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if(regs.e && regs.d.l == 0x00) {
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return op_read((regs.d & 0xff00) + ((regs.d + (addr & 0xffff)) & 0xff));
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} else {
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return op_read((regs.d + (addr & 0xffff)) & 0xffff);
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}
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}
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alwaysinline auto op_readsp(uint32 addr) -> uint8 {
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return op_read((regs.s + (addr & 0xffff)) & 0xffff);
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}
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alwaysinline auto op_writestack(uint8 data) -> void {
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op_write(regs.s.w, data);
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regs.e ? regs.s.l-- : regs.s.w--;
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}
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alwaysinline auto op_writestackn(uint8 data) -> void {
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op_write(regs.s.w--, data);
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}
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alwaysinline auto op_writeaddr(uint32 addr, uint8 data) -> void {
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op_write(addr & 0xffff, data);
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}
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alwaysinline auto op_writelong(uint32 addr, uint8 data) -> void {
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op_write(addr & 0xffffff, data);
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}
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alwaysinline auto op_writedbr(uint32 addr, uint8 data) -> void {
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op_write(((regs.db << 16) + addr) & 0xffffff, data);
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}
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alwaysinline auto op_writepbr(uint32 addr, uint8 data) -> void {
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op_write((regs.pc.b << 16) + (addr & 0xffff), data);
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}
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alwaysinline auto op_writedp(uint32 addr, uint8 data) -> void {
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if(regs.e && regs.d.l == 0x00) {
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op_write((regs.d & 0xff00) + ((regs.d + (addr & 0xffff)) & 0xff), data);
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} else {
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op_write((regs.d + (addr & 0xffff)) & 0xffff, data);
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}
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}
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alwaysinline auto op_writesp(uint32 addr, uint8 data) -> void {
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op_write((regs.s + (addr & 0xffff)) & 0xffff, data);
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}
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